Here is a photo of a system that has been in operation for 3.5 years. These MetaRocks have a single slit to increase surface area. Currently, we put three slits on each one. Again, no flushing, hosing, fluffing, replacing or washing has been done. MetaRocks are highly resistant to biological fouling and the most recent sample from this system measured about 6 mg/l total nitrogen. You can imagine how easy Eliminite maintenance is compared to other systems.
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